/*
 * Created on Jan 19, 2007
 * Created by Paul Gardner
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

package com.aelitis.azureus.core.peermanager.messaging.azureus;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.gudy.azureus2.core3.util.DirectByteBuffer;

import com.aelitis.azureus.core.peermanager.messaging.Message;
import com.aelitis.azureus.core.peermanager.messaging.MessageException;
import com.aelitis.azureus.core.peermanager.messaging.MessagingUtil;

public class AZHave implements AZMessage {
    private final byte version;
    private DirectByteBuffer buffer = null;

    private int[] piece_numbers;

    public AZHave(int[] _piece_numbers, byte _version) {
        piece_numbers = _piece_numbers;
        version = _version;
    }

    public String getID() {
        return (AZMessage.ID_AZ_HAVE);
    }

    public byte[] getIDBytes() {
        return (AZMessage.ID_AZ_HAVE_BYTES);
    }

    public String getFeatureID() {
        return (AZMessage.AZ_FEATURE_ID);
    }

    public int getFeatureSubID() {
        return (AZMessage.SUBID_ID_AZ_HAVE);
    }

    public int getType() {
        return (Message.TYPE_PROTOCOL_PAYLOAD);
    }

    public byte getVersion() {
        return version;
    };

    public String getDescription() {
        StringBuffer str = new StringBuffer(piece_numbers.length * 10);

        for (int i = 0; i < piece_numbers.length; i++) {

            if (i > 0) {
                str.append(",");
            }

            str.append(piece_numbers[i]);
        }

        return (getID() + " " + str);
    }

    public int[] getPieceNumbers() {
        return (piece_numbers);
    }

    public DirectByteBuffer[] getData() {
        if (buffer == null) {

            Map map = new HashMap();

            List l = new ArrayList(piece_numbers.length);

            for (int i = 0; i < piece_numbers.length; i++) {

                l.add(new Long(piece_numbers[i]));
            }

            map.put("pieces", l);

            buffer = MessagingUtil.convertPayloadToBencodedByteStream(map, DirectByteBuffer.AL_MSG);
        }

        return new DirectByteBuffer[] { buffer };
    }

    public Message deserialize(DirectByteBuffer data, byte version)

    throws MessageException {
        Map payload = MessagingUtil.convertBencodedByteStreamToPayload(data, 1, getID());

        List l = (List) payload.get("pieces");

        int[] pieces = new int[l.size()];

        for (int i = 0; i < pieces.length; i++) {

            pieces[i] = ((Long) l.get(i)).intValue();
        }

        AZHave message = new AZHave(pieces, version);

        return (message);
    }

    public void destroy() {
        if (buffer != null) {

            buffer.returnToPool();
        }
    }
}
